I lived in Sun River for a few years. Never hunted down there but did explore quite a bit. My take on it is yes, roads and single track everywhere. High use area year round, southern end of the unit near Crane Prairie/Wickiup was more isolated . There was 3 buttes down south of Wickiup that only had rds at the bases . Could get away from users up on the slopes of those. Hard to pattern deer movement in those big flats. Saw some nice deer occasionally. Gets poached pretty hard down around La Pine. Been 5 or so years since I was there.
If I were to hunt it, I’d be looking for pockets between all the rds and hang as many cameras as I could get my hands on.